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                    第一章：起步
            
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                    1.1：移动开发技术简介
            
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                    1.2：初识Flutter
            
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                    1.3：搭建Flutter开发环境
            
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                    1.4：Dart语言简介
            
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                    第二章：第一个Flutter应用
            
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                    2.1：计数器示例
            
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                    2.2：路由管理
            
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                    2.3：包管理
            
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                    2.4：资源管理
            
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                    2.5：调试Flutter APP
            
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                    2.6：Dart线程模型及异常捕获
            
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                    第三章：基础组件
            
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                    3.1：Widget简介
            
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                    3.2：状态管理
            
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                    3.3：文本、字体样式
            
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                    3.4：按钮
            
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                    3.5：图片和Icon
            
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                    3.6：单选框和复选框
            
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                    3.7：输入框和表单
            
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                    3.8：进度指示器
            
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                    第四章：布局类组件
            
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                    4.1：布局类组件简介
            
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                    4.2：线性布局（Row、Column）
            
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                    4.3：弹性布局（Flex）
            
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                    4.4：流式布局（Wrap、Flow）
            
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                    4.5：层叠布局（Stack、Positioned）
            
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                    4.6：对齐与相对定位（Align）
            
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                    第五章：容器类组件
            
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                    5.1：填充（Padding）
            
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                    5.2：尺寸限制类容器（ConstrainedBox等）
            
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                    5.3：装饰容器（DecoratedBox）
            
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                    5.4：变换（Transform）
            
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                    5.5：Container容器
            
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                    5.6：Scaffold、TabBar、底部导航
            
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                    5.7：剪裁（Clip）
            
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                    第六章：可滚动组件
            
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        <li class="chapter " data-level="2.6.1" data-path="../chapter6/intro.html">
            
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                    6.1：可滚动组件简介
            
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                    6.2：SingleChildScrollView
            
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                    6.3：ListView
            
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                    6.4：GridView
            
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                    6.5：CustomScrollView
            
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                    6.6：滚动监听及控制（ScrollController）
            
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                    第七章：功能型组件
            
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                    7.1：导航返回拦截（WillPopScope）
            
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                    7.2：数据共享（InheritedWidget）
            
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                    7.3： 跨组件状态共享（Provider）
            
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                    7.4：颜色和主题（Theme）
            
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                    7.5：异步UI更新（FutureBuilder、StreamBuilder）
            
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                    7.6：对话框详解
            
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        <li class="header">进阶篇</li>
        
        
    
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                    第八章：事件处理与通知
            
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        <li class="chapter " data-level="3.1.1" data-path="../chapter8/listener.html">
            
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                    8.1：原始指针事件处理
            
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                    8.2：手势识别
            
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        <li class="chapter " data-level="3.1.3" data-path="../chapter8/eventbus.html">
            
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                    8.3：全局事件总线
            
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                    8.4：通知(Notification)
            
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        <li class="chapter " data-level="3.2" data-path="../chapter9/">
            
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                    第九章：动画
            
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        <li class="chapter " data-level="3.2.1" data-path="../chapter9/intro.html">
            
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                    9.1：Flutter动画简介
            
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        <li class="chapter " data-level="3.2.2" data-path="../chapter9/animation_structure.html">
            
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                    9.2：动画结构
            
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                    9.3：自定义路由过渡动画
            
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                    9.4：Hero动画
            
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                    9.5：交织动画
            
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                    9.6：通用“动画切换”组件（AnimatedSwitcher）
            
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                    9.7：动画过渡组件
            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.3" data-path="../chapter10/">
            
                <a href="../chapter10/">
            
                    
                    第十章：自定义组件
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.3.1" data-path="../chapter10/intro.html">
            
                <a href="../chapter10/intro.html">
            
                    
                    10.1：自定义组件方法简介
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.3.2" data-path="../chapter10/combine.html">
            
                <a href="../chapter10/combine.html">
            
                    
                    10.2：组合现有组件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.3.3" data-path="../chapter10/turn_box.html">
            
                <a href="../chapter10/turn_box.html">
            
                    
                    10.3：组合实例：TurnBox
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.3.4" data-path="../chapter10/custom_paint.html">
            
                <a href="../chapter10/custom_paint.html">
            
                    
                    10.4：自绘组件（CustomPaint与Canvas）
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.3.5" data-path="../chapter10/gradient_circular_progress_demo.html">
            
                <a href="../chapter10/gradient_circular_progress_demo.html">
            
                    
                    10.5：自绘实例：圆形渐变进度条(自绘)
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.4" data-path="../chapter11/">
            
                <a href="../chapter11/">
            
                    
                    第十一章：文件操作与网络请求
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.4.1" data-path="../chapter11/file_operation.html">
            
                <a href="../chapter11/file_operation.html">
            
                    
                    11.1：文件操作
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.2" data-path="../chapter11/http.html">
            
                <a href="../chapter11/http.html">
            
                    
                    11.2：Http请求-HttpClient
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.3" data-path="../chapter11/dio.html">
            
                <a href="../chapter11/dio.html">
            
                    
                    11.3：Http请求-Dio package
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.4" data-path="../chapter11/download_with_chunks.html">
            
                <a href="../chapter11/download_with_chunks.html">
            
                    
                    11.4：实例：Http分块下载
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.5" data-path="../chapter11/websocket.html">
            
                <a href="../chapter11/websocket.html">
            
                    
                    11.5：WebSocket
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.6" data-path="../chapter11/socket.html">
            
                <a href="../chapter11/socket.html">
            
                    
                    11.6：使用Socket API
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.4.7" data-path="../chapter11/json_model.html">
            
                <a href="../chapter11/json_model.html">
            
                    
                    11.7：Json转Dart Model类
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.5" data-path="../chapter12/">
            
                <a href="../chapter12/">
            
                    
                    第十二章：包与插件
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.5.1" data-path="../chapter12/develop_package.html">
            
                <a href="../chapter12/develop_package.html">
            
                    
                    12.1：开发package
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.2" data-path="../chapter12/platform-channel.html">
            
                <a href="../chapter12/platform-channel.html">
            
                    
                    12.2：平台通道简介
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.3" data-path="../chapter12/develop_plugin.html">
            
                <a href="../chapter12/develop_plugin.html">
            
                    
                    12.3：开发Flutter插件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.4" data-path="../chapter12/android_implement.html">
            
                <a href="../chapter12/android_implement.html">
            
                    
                    12.4：插件开发：实现Android端API
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.5" data-path="../chapter12/ios_implement.html">
            
                <a href="../chapter12/ios_implement.html">
            
                    
                    12.5：插件开发：实现IOS端API
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.6" data-path="../chapter12/texture_platformview.html">
            
                <a href="../chapter12/texture_platformview.html">
            
                    
                    12.6：Texture和PlatformView
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.6" data-path="../chapter13/">
            
                <a href="../chapter13/">
            
                    
                    第十三章：国际化
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.6.1" data-path="../chapter13/multi_languages_support.html">
            
                <a href="../chapter13/multi_languages_support.html">
            
                    
                    13.1：让App支持多语言
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.6.2" data-path="../chapter13/locallization_implement.html">
            
                <a href="../chapter13/locallization_implement.html">
            
                    
                    13.2：实现Localizations
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.6.3" data-path="../chapter13/intl.html">
            
                <a href="../chapter13/intl.html">
            
                    
                    13.3：使用Intl包
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.6.4" data-path="../chapter13/faq.html">
            
                <a href="../chapter13/faq.html">
            
                    
                    13.4：国际化常见问题
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.7" data-path="../chapter14/">
            
                <a href="../chapter14/">
            
                    
                    第十四章：Flutter核心原理
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.7.1" data-path="../chapter14/flutter_ui_system.html">
            
                <a href="../chapter14/flutter_ui_system.html">
            
                    
                    14.1：Flutter UI系统
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.7.2" data-path="../chapter14/element_buildcontext.html">
            
                <a href="../chapter14/element_buildcontext.html">
            
                    
                    14.2：Element和BuildContext
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.7.3" data-path="../chapter14/render_object.html">
            
                <a href="../chapter14/render_object.html">
            
                    
                    14.3：RenderObject与RenderBox
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.7.4" data-path="../chapter14/flutter_app_startup.html">
            
                <a href="../chapter14/flutter_app_startup.html">
            
                    
                    14.4：Flutter从启动到显示
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.7.5" data-path="../chapter14/image_and_cache.html">
            
                <a href="../chapter14/image_and_cache.html">
            
                    
                    14.5：Flutter图片加载与缓存
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="header">实例篇</li>
        
        
    
        <li class="chapter " data-level="4.1" data-path="../chapter15/intro.html">
            
                <a href="../chapter15/intro.html">
            
                    
                    第十五章：一个完整的Flutter应用
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="4.1.1" data-path="../chapter15/intro.html">
            
                <a href="../chapter15/intro.html">
            
                    
                    15.1：应用简介
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.2" data-path="../chapter15/code_structure.html">
            
                <a href="../chapter15/code_structure.html">
            
                    
                    15.2：APP代码结构
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.3" data-path="../chapter15/models.html">
            
                <a href="../chapter15/models.html">
            
                    
                    15.3：Model类定义
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.4" data-path="../chapter15/globals.html">
            
                <a href="../chapter15/globals.html">
            
                    
                    15.4：全局变量及共享状态
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.5" data-path="../chapter15/network.html">
            
                <a href="../chapter15/network.html">
            
                    
                    15.5：网络请求封装
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.6" data-path="../chapter15/entry.html">
            
                <a href="../chapter15/entry.html">
            
                    
                    15.6：App入口及首页
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.7" data-path="../chapter15/login_page.html">
            
                <a href="../chapter15/login_page.html">
            
                    
                    15.7：登录页
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.8" data-path="../chapter15/language_and_theme_setting.html">
            
                <a href="../chapter15/language_and_theme_setting.html">
            
                    
                    15.8：多语言和多主题
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    

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                                <h1 id="74-&#x989C;&#x8272;&#x548C;&#x4E3B;&#x9898;">7.4 &#x989C;&#x8272;&#x548C;&#x4E3B;&#x9898;</h1>
<h2 id="741-&#x989C;&#x8272;">7.4.1 &#x989C;&#x8272;</h2>
<p>&#x5728;&#x4ECB;&#x7ECD;&#x4E3B;&#x9898;&#x524D;&#x6211;&#x4EEC;&#x5148;&#x4E86;&#x89E3;&#x4E00;&#x4E9B;Flutter&#x4E2D;&#x7684;Color&#x7C7B;&#x3002;Color&#x7C7B;&#x4E2D;&#x989C;&#x8272;&#x4EE5;&#x4E00;&#x4E2A;int&#x503C;&#x4FDD;&#x5B58;&#xFF0C;&#x6211;&#x4EEC;&#x77E5;&#x9053;&#x663E;&#x793A;&#x5668;&#x989C;&#x8272;&#x662F;&#x7531;&#x7EA2;&#x3001;&#x7EFF;&#x3001;&#x84DD;&#x4E09;&#x57FA;&#x8272;&#x7EC4;&#x6210;&#xFF0C;&#x6BCF;&#x79CD;&#x989C;&#x8272;&#x5360;8&#x6BD4;&#x7279;&#xFF0C;&#x5B58;&#x50A8;&#x7ED3;&#x6784;&#x5982;&#x4E0B;&#xFF1A;</p>
<table>
<thead>
<tr>
<th>Bit&#xFF08;&#x4F4D;&#xFF09;</th>
<th>&#x989C;&#x8272;</th>
</tr>
</thead>
<tbody>
<tr>
<td>0-7</td>
<td>&#x84DD;&#x8272;</td>
</tr>
<tr>
<td>8-15</td>
<td>&#x7EFF;&#x8272;</td>
</tr>
<tr>
<td>16-23</td>
<td>&#x7EA2;&#x8272;</td>
</tr>
<tr>
<td>24-31</td>
<td>Alpha (&#x4E0D;&#x900F;&#x660E;&#x5EA6;)</td>
</tr>
</tbody>
</table>
<p>&#x4E0A;&#x9762;&#x8868;&#x683C;&#x4E2D;&#x7684;&#x7684;&#x5B57;&#x6BB5;&#x5728;Color&#x7C7B;&#x4E2D;&#x90FD;&#x6709;&#x5BF9;&#x5E94;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x800C;Color&#x4E2D;&#x7684;&#x4F17;&#x591A;&#x65B9;&#x6CD5;&#x4E5F;&#x5C31;&#x662F;&#x64CD;&#x4F5C;&#x8FD9;&#x4E9B;&#x5C5E;&#x6027;&#x7684;&#xFF0C;&#x7531;&#x4E8E;&#x5927;&#x591A;&#x6BD4;&#x8F83;&#x7B80;&#x5355;&#xFF0C;&#x8BFB;&#x8005;&#x53EF;&#x4EE5;&#x67E5;&#x770B;&#x7C7B;&#x5B9A;&#x4E49;&#x4E86;&#x89E3;&#x3002;&#x5728;&#x6B64;&#x6211;&#x4EEC;&#x4E3B;&#x8981;&#x8BA8;&#x8BBA;&#x4E24;&#x70B9;&#xFF1A;&#x8272;&#x503C;&#x8F6C;&#x6362;&#x548C;&#x4EAE;&#x5EA6;&#x3002;</p>
<h3 id="&#x5982;&#x4F55;&#x5C06;&#x989C;&#x8272;&#x5B57;&#x7B26;&#x4E32;&#x8F6C;&#x6210;color&#x5BF9;&#x8C61;"><strong>&#x5982;&#x4F55;&#x5C06;&#x989C;&#x8272;&#x5B57;&#x7B26;&#x4E32;&#x8F6C;&#x6210;Color&#x5BF9;&#x8C61;</strong></h3>
<p>&#x5982;Web&#x5F00;&#x53D1;&#x4E2D;&#x7684;&#x8272;&#x503C;&#x901A;&#x5E38;&#x662F;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x4E32;&#x5982;&quot;#dc380d&quot;&#xFF0C;&#x5B83;&#x662F;&#x4E00;&#x4E2A;RGB&#x503C;&#xFF0C;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#x4E0B;&#x9762;&#x8FD9;&#x4E9B;&#x65B9;&#x6CD5;&#x5C06;&#x5176;&#x8F6C;&#x4E3A;Color&#x7C7B;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token function">Color</span><span class="token punctuation">(</span><span class="token number">0xffdc380d</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//&#x5982;&#x679C;&#x989C;&#x8272;&#x56FA;&#x5B9A;&#x53EF;&#x4EE5;&#x76F4;&#x63A5;&#x4F7F;&#x7528;&#x6574;&#x6570;&#x503C;</span>
<span class="token comment">//&#x989C;&#x8272;&#x662F;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x4E32;&#x53D8;&#x91CF;</span>
<span class="token keyword">var</span> c <span class="token operator">=</span> <span class="token string">&quot;dc380d&quot;</span><span class="token punctuation">;</span>
<span class="token function">Color</span><span class="token punctuation">(</span>int<span class="token punctuation">.</span><span class="token function">parse</span><span class="token punctuation">(</span>c<span class="token punctuation">,</span>radix<span class="token punctuation">:</span><span class="token number">16</span><span class="token punctuation">)</span><span class="token operator">|</span><span class="token number">0xFF000000</span><span class="token punctuation">)</span> <span class="token comment">//&#x901A;&#x8FC7;&#x4F4D;&#x8FD0;&#x7B97;&#x7B26;&#x5C06;Alpha&#x8BBE;&#x7F6E;&#x4E3A;FF</span>
<span class="token function">Color</span><span class="token punctuation">(</span>int<span class="token punctuation">.</span><span class="token function">parse</span><span class="token punctuation">(</span>c<span class="token punctuation">,</span>radix<span class="token punctuation">:</span><span class="token number">16</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">withAlpha</span><span class="token punctuation">(</span><span class="token number">255</span><span class="token punctuation">)</span>  <span class="token comment">//&#x901A;&#x8FC7;&#x65B9;&#x6CD5;&#x5C06;Alpha&#x8BBE;&#x7F6E;&#x4E3A;FF</span>
</code></pre>
<h3 id="&#x989C;&#x8272;&#x4EAE;&#x5EA6;">&#x989C;&#x8272;&#x4EAE;&#x5EA6;</h3>
<p>&#x5047;&#x5982;&#xFF0C;&#x6211;&#x4EEC;&#x8981;&#x5B9E;&#x73B0;&#x4E00;&#x4E2A;&#x80CC;&#x666F;&#x989C;&#x8272;&#x548C;Title&#x53EF;&#x4EE5;&#x81EA;&#x5B9A;&#x4E49;&#x7684;&#x5BFC;&#x822A;&#x680F;&#xFF0C;&#x5E76;&#x4E14;&#x80CC;&#x666F;&#x8272;&#x4E3A;&#x6DF1;&#x8272;&#x65F6;&#x6211;&#x4EEC;&#x5E94;&#x8BE5;&#x8BA9;Title&#x663E;&#x793A;&#x4E3A;&#x6D45;&#x8272;&#xFF1B;&#x80CC;&#x666F;&#x8272;&#x4E3A;&#x6D45;&#x8272;&#x65F6;&#xFF0C;Title&#x663E;&#x793A;&#x4E3A;&#x6DF1;&#x8272;&#x3002;&#x8981;&#x5B9E;&#x73B0;&#x8FD9;&#x4E2A;&#x529F;&#x80FD;&#xFF0C;&#x6211;&#x4EEC;&#x5C31;&#x9700;&#x8981;&#x6765;&#x8BA1;&#x7B97;&#x80CC;&#x666F;&#x8272;&#x7684;&#x4EAE;&#x5EA6;&#xFF0C;&#x7136;&#x540E;&#x52A8;&#x6001;&#x6765;&#x786E;&#x5B9A;Title&#x7684;&#x989C;&#x8272;&#x3002;Color&#x7C7B;&#x4E2D;&#x63D0;&#x4F9B;&#x4E86;&#x4E00;&#x4E2A;<code>computeLuminance()</code>&#x65B9;&#x6CD5;&#xFF0C;&#x5B83;&#x53EF;&#x4EE5;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;[0-1]&#x7684;&#x4E00;&#x4E2A;&#x503C;&#xFF0C;&#x6570;&#x5B57;&#x8D8A;&#x5927;&#x989C;&#x8272;&#x5C31;&#x8D8A;&#x6D45;&#xFF0C;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x6839;&#x636E;&#x5B83;&#x6765;&#x52A8;&#x6001;&#x786E;&#x5B9A;Title&#x7684;&#x989C;&#x8272;&#xFF0C;&#x4E0B;&#x9762;&#x662F;&#x5BFC;&#x822A;&#x680F;NavBar&#x7684;&#x7B80;&#x5355;&#x5B9E;&#x73B0;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token keyword">class</span> <span class="token class-name">NavBar</span> <span class="token keyword">extends</span> <span class="token class-name">StatelessWidget</span> <span class="token punctuation">{</span>
  <span class="token keyword">final</span> String title<span class="token punctuation">;</span>
  <span class="token keyword">final</span> Color color<span class="token punctuation">;</span> <span class="token comment">//&#x80CC;&#x666F;&#x989C;&#x8272;</span>

  <span class="token function">NavBar</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    Key key<span class="token punctuation">,</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>color<span class="token punctuation">,</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>title<span class="token punctuation">,</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

  <span class="token metadata symbol">@override</span>
  Widget <span class="token function">build</span><span class="token punctuation">(</span>BuildContext context<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token function">Container</span><span class="token punctuation">(</span>
      constraints<span class="token punctuation">:</span> <span class="token function">BoxConstraints</span><span class="token punctuation">(</span>
        minHeight<span class="token punctuation">:</span> <span class="token number">52</span><span class="token punctuation">,</span>
        minWidth<span class="token punctuation">:</span> double<span class="token punctuation">.</span>infinity<span class="token punctuation">,</span>
      <span class="token punctuation">)</span><span class="token punctuation">,</span>
      decoration<span class="token punctuation">:</span> <span class="token function">BoxDecoration</span><span class="token punctuation">(</span>
        color<span class="token punctuation">:</span> color<span class="token punctuation">,</span>
        boxShadow<span class="token punctuation">:</span> <span class="token punctuation">[</span>
          <span class="token comment">//&#x9634;&#x5F71;</span>
          <span class="token function">BoxShadow</span><span class="token punctuation">(</span>
            color<span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>black26<span class="token punctuation">,</span>
            offset<span class="token punctuation">:</span> <span class="token function">Offset</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
            blurRadius<span class="token punctuation">:</span> <span class="token number">3</span><span class="token punctuation">,</span>
          <span class="token punctuation">)</span><span class="token punctuation">,</span>
        <span class="token punctuation">]</span><span class="token punctuation">,</span>
      <span class="token punctuation">)</span><span class="token punctuation">,</span>
      child<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span>
        title<span class="token punctuation">,</span>
        style<span class="token punctuation">:</span> <span class="token function">TextStyle</span><span class="token punctuation">(</span>
          fontWeight<span class="token punctuation">:</span> FontWeight<span class="token punctuation">.</span>bold<span class="token punctuation">,</span>
          <span class="token comment">//&#x6839;&#x636E;&#x80CC;&#x666F;&#x8272;&#x4EAE;&#x5EA6;&#x6765;&#x786E;&#x5B9A;Title&#x989C;&#x8272;</span>
          color<span class="token punctuation">:</span> color<span class="token punctuation">.</span><span class="token function">computeLuminance</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&lt;</span> <span class="token number">0.5</span> <span class="token operator">?</span> Colors<span class="token punctuation">.</span>white <span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>black<span class="token punctuation">,</span>
        <span class="token punctuation">)</span><span class="token punctuation">,</span>
      <span class="token punctuation">)</span><span class="token punctuation">,</span>
      alignment<span class="token punctuation">:</span> Alignment<span class="token punctuation">.</span>center<span class="token punctuation">,</span>
    <span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x6D4B;&#x8BD5;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token function">Column</span><span class="token punctuation">(</span>
  children<span class="token punctuation">:</span> <span class="token operator">&lt;</span>Widget<span class="token operator">&gt;</span><span class="token punctuation">[</span>
    <span class="token comment">//&#x80CC;&#x666F;&#x4E3A;&#x84DD;&#x8272;&#xFF0C;&#x5219;title&#x81EA;&#x52A8;&#x4E3A;&#x767D;&#x8272;</span>
    <span class="token function">NavBar</span><span class="token punctuation">(</span>color<span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>blue<span class="token punctuation">,</span> title<span class="token punctuation">:</span> <span class="token string">&quot;&#x6807;&#x9898;&quot;</span><span class="token punctuation">)</span><span class="token punctuation">,</span> 
    <span class="token comment">//&#x80CC;&#x666F;&#x4E3A;&#x767D;&#x8272;&#xFF0C;&#x5219;title&#x81EA;&#x52A8;&#x4E3A;&#x9ED1;&#x8272;</span>
    <span class="token function">NavBar</span><span class="token punctuation">(</span>color<span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>white<span class="token punctuation">,</span> title<span class="token punctuation">:</span> <span class="token string">&quot;&#x6807;&#x9898;&quot;</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
  <span class="token punctuation">]</span>
<span class="token punctuation">)</span>
</code></pre>
<p>&#x8FD0;&#x884C;&#x6548;&#x679C;&#x5982;&#x56FE;7-4&#x6240;&#x793A;&#xFF1A;</p>
<p><img src="https://pcdn.flutterchina.club/imgs/7-4.png" alt="NavBar"></p>
<h3 id="materialcolor">MaterialColor</h3>
<p><code>MaterialColor</code>&#x662F;&#x5B9E;&#x73B0;Material Design&#x4E2D;&#x7684;&#x989C;&#x8272;&#x7684;&#x7C7B;&#xFF0C;&#x5B83;&#x5305;&#x542B;&#x4E00;&#x79CD;&#x989C;&#x8272;&#x7684;10&#x4E2A;&#x7EA7;&#x522B;&#x7684;&#x6E10;&#x53D8;&#x8272;&#x3002;<code>MaterialColor</code>&#x901A;&#x8FC7;&quot;[]&quot;&#x8FD0;&#x7B97;&#x7B26;&#x7684;&#x7D22;&#x5F15;&#x503C;&#x6765;&#x4EE3;&#x8868;&#x989C;&#x8272;&#x7684;&#x6DF1;&#x5EA6;&#xFF0C;&#x6709;&#x6548;&#x7684;&#x7D22;&#x5F15;&#x6709;&#xFF1A;50&#xFF0C;100&#xFF0C;200&#xFF0C;&#x2026;&#xFF0C;900&#xFF0C;&#x6570;&#x5B57;&#x8D8A;&#x5927;&#xFF0C;&#x989C;&#x8272;&#x8D8A;&#x6DF1;&#x3002;<code>MaterialColor</code>&#x7684;&#x9ED8;&#x8BA4;&#x503C;&#x4E3A;&#x7D22;&#x5F15;&#x7B49;&#x4E8E;500&#x7684;&#x989C;&#x8272;&#x3002;&#x4E3E;&#x4E2A;&#x4F8B;&#x5B50;&#xFF0C;<code>Colors.blue</code>&#x662F;&#x9884;&#x5B9A;&#x4E49;&#x7684;&#x4E00;&#x4E2A;<code>MaterialColor</code>&#x7C7B;&#x5BF9;&#x8C61;&#xFF0C;&#x5B9A;&#x4E49;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token keyword">static</span> <span class="token keyword">const</span> MaterialColor blue <span class="token operator">=</span> <span class="token function">MaterialColor</span><span class="token punctuation">(</span>
  _bluePrimaryValue<span class="token punctuation">,</span>
  <span class="token operator">&lt;</span>int<span class="token punctuation">,</span> Color<span class="token operator">&gt;</span><span class="token punctuation">{</span>
     <span class="token number">50</span><span class="token punctuation">:</span> <span class="token function">Color</span><span class="token punctuation">(</span><span class="token number">0xFFE3F2FD</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token number">100</span><span class="token punctuation">:</span> <span class="token function">Color</span><span class="token punctuation">(</span><span class="token number">0xFFBBDEFB</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token number">200</span><span class="token punctuation">:</span> <span class="token function">Color</span><span class="token punctuation">(</span><span class="token number">0xFF90CAF9</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token number">300</span><span class="token punctuation">:</span> <span class="token function">Color</span><span class="token punctuation">(</span><span class="token number">0xFF64B5F6</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token number">400</span><span class="token punctuation">:</span> <span class="token function">Color</span><span class="token punctuation">(</span><span class="token number">0xFF42A5F5</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token number">500</span><span class="token punctuation">:</span> <span class="token function">Color</span><span class="token punctuation">(</span>_bluePrimaryValue<span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token number">600</span><span class="token punctuation">:</span> <span class="token function">Color</span><span class="token punctuation">(</span><span class="token number">0xFF1E88E5</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token number">700</span><span class="token punctuation">:</span> <span class="token function">Color</span><span class="token punctuation">(</span><span class="token number">0xFF1976D2</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token number">800</span><span class="token punctuation">:</span> <span class="token function">Color</span><span class="token punctuation">(</span><span class="token number">0xFF1565C0</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token number">900</span><span class="token punctuation">:</span> <span class="token function">Color</span><span class="token punctuation">(</span><span class="token number">0xFF0D47A1</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">static</span> <span class="token keyword">const</span> int _bluePrimaryValue <span class="token operator">=</span> <span class="token number">0xFF2196F3</span><span class="token punctuation">;</span>
</code></pre>
<p><code>Colors.blue[50]</code>&#x5230;<code>Colors.blue[100]</code>&#x7684;&#x8272;&#x503C;&#x4ECE;&#x6D45;&#x84DD;&#x5230;&#x6DF1;&#x84DD;&#x6E10;&#x53D8;&#xFF0C;&#x6548;&#x679C;&#x5982;&#x56FE;7-5&#x6240;&#x793A;&#xFF1A;</p>
<p><img src="https://pcdn.flutterchina.club/imgs/7-5.jpeg" alt="NavBar"></p>
<h2 id="742-theme">7.4.2 Theme</h2>
<p><code>Theme</code>&#x7EC4;&#x4EF6;&#x53EF;&#x4EE5;&#x4E3A;Material APP&#x5B9A;&#x4E49;&#x4E3B;&#x9898;&#x6570;&#x636E;&#xFF08;ThemeData&#xFF09;&#x3002;Material&#x7EC4;&#x4EF6;&#x5E93;&#x91CC;&#x5F88;&#x591A;&#x7EC4;&#x4EF6;&#x90FD;&#x4F7F;&#x7528;&#x4E86;&#x4E3B;&#x9898;&#x6570;&#x636E;&#xFF0C;&#x5982;&#x5BFC;&#x822A;&#x680F;&#x989C;&#x8272;&#x3001;&#x6807;&#x9898;&#x5B57;&#x4F53;&#x3001;Icon&#x6837;&#x5F0F;&#x7B49;&#x3002;<code>Theme</code>&#x5185;&#x4F1A;&#x4F7F;&#x7528;<code>InheritedWidget</code>&#x6765;&#x4E3A;&#x5176;&#x5B50;&#x6811;&#x5171;&#x4EAB;&#x6837;&#x5F0F;&#x6570;&#x636E;&#x3002;</p>
<h3 id="themedata">ThemeData</h3>
<p><code>ThemeData</code>&#x7528;&#x4E8E;&#x4FDD;&#x5B58;&#x662F;Material &#x7EC4;&#x4EF6;&#x5E93;&#x7684;&#x4E3B;&#x9898;&#x6570;&#x636E;&#xFF0C;Material&#x7EC4;&#x4EF6;&#x9700;&#x8981;&#x9075;&#x5B88;&#x76F8;&#x5E94;&#x7684;&#x8BBE;&#x8BA1;&#x89C4;&#x8303;&#xFF0C;&#x800C;&#x8FD9;&#x4E9B;&#x89C4;&#x8303;&#x53EF;&#x81EA;&#x5B9A;&#x4E49;&#x90E8;&#x5206;&#x90FD;&#x5B9A;&#x4E49;&#x5728;ThemeData&#x4E2D;&#x4E86;&#xFF0C;&#x6240;&#x4EE5;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;ThemeData&#x6765;&#x81EA;&#x5B9A;&#x4E49;&#x5E94;&#x7528;&#x4E3B;&#x9898;&#x3002;&#x5728;&#x5B50;&#x7EC4;&#x4EF6;&#x4E2D;&#xFF0C;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;<code>Theme.of</code>&#x65B9;&#x6CD5;&#x6765;&#x83B7;&#x53D6;&#x5F53;&#x524D;&#x7684;<code>ThemeData</code>&#x3002;</p>
<blockquote>
<p>&#x6CE8;&#x610F;&#xFF1A;Material Design &#x8BBE;&#x8BA1;&#x89C4;&#x8303;&#x4E2D;&#x6709;&#x4E9B;&#x662F;&#x4E0D;&#x80FD;&#x81EA;&#x5B9A;&#x4E49;&#x7684;&#xFF0C;&#x5982;&#x5BFC;&#x822A;&#x680F;&#x9AD8;&#x5EA6;&#xFF0C;ThemeData&#x53EA;&#x5305;&#x542B;&#x4E86;&#x53EF;&#x81EA;&#x5B9A;&#x4E49;&#x90E8;&#x5206;&#x3002;</p>
</blockquote>
<p>&#x6211;&#x4EEC;&#x770B;&#x770B;<code>ThemeData</code>&#x90E8;&#x5206;&#x6570;&#x636E;&#x5B9A;&#x4E49;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart"><span class="token function">ThemeData</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  Brightness brightness<span class="token punctuation">,</span> <span class="token comment">//&#x6DF1;&#x8272;&#x8FD8;&#x662F;&#x6D45;&#x8272;</span>
  MaterialColor primarySwatch<span class="token punctuation">,</span> <span class="token comment">//&#x4E3B;&#x9898;&#x989C;&#x8272;&#x6837;&#x672C;&#xFF0C;&#x89C1;&#x4E0B;&#x9762;&#x4ECB;&#x7ECD;</span>
  Color primaryColor<span class="token punctuation">,</span> <span class="token comment">//&#x4E3B;&#x8272;&#xFF0C;&#x51B3;&#x5B9A;&#x5BFC;&#x822A;&#x680F;&#x989C;&#x8272;</span>
  Color accentColor<span class="token punctuation">,</span> <span class="token comment">//&#x6B21;&#x7EA7;&#x8272;&#xFF0C;&#x51B3;&#x5B9A;&#x5927;&#x591A;&#x6570;Widget&#x7684;&#x989C;&#x8272;&#xFF0C;&#x5982;&#x8FDB;&#x5EA6;&#x6761;&#x3001;&#x5F00;&#x5173;&#x7B49;&#x3002;</span>
  Color cardColor<span class="token punctuation">,</span> <span class="token comment">//&#x5361;&#x7247;&#x989C;&#x8272;</span>
  Color dividerColor<span class="token punctuation">,</span> <span class="token comment">//&#x5206;&#x5272;&#x7EBF;&#x989C;&#x8272;</span>
  ButtonThemeData buttonTheme<span class="token punctuation">,</span> <span class="token comment">//&#x6309;&#x94AE;&#x4E3B;&#x9898;</span>
  Color cursorColor<span class="token punctuation">,</span> <span class="token comment">//&#x8F93;&#x5165;&#x6846;&#x5149;&#x6807;&#x989C;&#x8272;</span>
  Color dialogBackgroundColor<span class="token punctuation">,</span><span class="token comment">//&#x5BF9;&#x8BDD;&#x6846;&#x80CC;&#x666F;&#x989C;&#x8272;</span>
  String fontFamily<span class="token punctuation">,</span> <span class="token comment">//&#x6587;&#x5B57;&#x5B57;&#x4F53;</span>
  TextTheme textTheme<span class="token punctuation">,</span><span class="token comment">// &#x5B57;&#x4F53;&#x4E3B;&#x9898;&#xFF0C;&#x5305;&#x62EC;&#x6807;&#x9898;&#x3001;body&#x7B49;&#x6587;&#x5B57;&#x6837;&#x5F0F;</span>
  IconThemeData iconTheme<span class="token punctuation">,</span> <span class="token comment">// Icon&#x7684;&#x9ED8;&#x8BA4;&#x6837;&#x5F0F;</span>
  TargetPlatform platform<span class="token punctuation">,</span> <span class="token comment">//&#x6307;&#x5B9A;&#x5E73;&#x53F0;&#xFF0C;&#x5E94;&#x7528;&#x7279;&#x5B9A;&#x5E73;&#x53F0;&#x63A7;&#x4EF6;&#x98CE;&#x683C;</span>
  <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x53EA;&#x662F;<code>ThemeData</code>&#x7684;&#x4E00;&#x5C0F;&#x90E8;&#x5206;&#x5C5E;&#x6027;&#xFF0C;&#x5B8C;&#x6574;&#x7684;&#x6570;&#x636E;&#x5B9A;&#x4E49;&#x8BFB;&#x8005;&#x53EF;&#x4EE5;&#x67E5;&#x770B;SDK&#x3002;&#x4E0A;&#x9762;&#x5C5E;&#x6027;&#x4E2D;&#x9700;&#x8981;&#x8BF4;&#x660E;&#x7684;&#x662F;<code>primarySwatch</code>&#xFF0C;&#x5B83;&#x662F;&#x4E3B;&#x9898;&#x989C;&#x8272;&#x7684;&#x4E00;&#x4E2A;&quot;&#x6837;&#x672C;&#x8272;&quot;&#xFF0C;&#x901A;&#x8FC7;&#x8FD9;&#x4E2A;&#x6837;&#x672C;&#x8272;&#x53EF;&#x4EE5;&#x5728;&#x4E00;&#x4E9B;&#x6761;&#x4EF6;&#x4E0B;&#x751F;&#x6210;&#x4E00;&#x4E9B;&#x5176;&#x5B83;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x4F8B;&#x5982;&#xFF0C;&#x5982;&#x679C;&#x6CA1;&#x6709;&#x6307;&#x5B9A;<code>primaryColor</code>&#xFF0C;&#x5E76;&#x4E14;&#x5F53;&#x524D;&#x4E3B;&#x9898;&#x4E0D;&#x662F;&#x6DF1;&#x8272;&#x4E3B;&#x9898;&#xFF0C;&#x90A3;&#x4E48;<code>primaryColor</code>&#x5C31;&#x4F1A;&#x9ED8;&#x8BA4;&#x4E3A;<code>primarySwatch</code>&#x6307;&#x5B9A;&#x7684;&#x989C;&#x8272;&#xFF0C;&#x8FD8;&#x6709;&#x4E00;&#x4E9B;&#x76F8;&#x4F3C;&#x7684;&#x5C5E;&#x6027;&#x5982;<code>accentColor</code> &#x3001;<code>indicatorColor</code>&#x7B49;&#x4E5F;&#x4F1A;&#x53D7;<code>primarySwatch</code>&#x5F71;&#x54CD;&#x3002;</p>
<h3 id="&#x793A;&#x4F8B;">&#x793A;&#x4F8B;</h3>
<p>&#x6211;&#x4EEC;&#x5B9E;&#x73B0;&#x4E00;&#x4E2A;&#x8DEF;&#x7531;&#x6362;&#x80A4;&#x529F;&#x80FD;&#xFF1A;</p>
<pre class="language-"><code class="lang-dart">
<span class="token keyword">class</span> <span class="token class-name">ThemeTestRoute</span> <span class="token keyword">extends</span> <span class="token class-name">StatefulWidget</span> <span class="token punctuation">{</span>
  <span class="token metadata symbol">@override</span>
  _ThemeTestRouteState <span class="token function">createState</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token keyword">new</span> <span class="token class-name">_ThemeTestRouteState</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">class</span> <span class="token class-name">_ThemeTestRouteState</span> <span class="token keyword">extends</span> <span class="token class-name">State</span><span class="token operator">&lt;</span>ThemeTestRoute<span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  Color _themeColor <span class="token operator">=</span> Colors<span class="token punctuation">.</span>teal<span class="token punctuation">;</span> <span class="token comment">//&#x5F53;&#x524D;&#x8DEF;&#x7531;&#x4E3B;&#x9898;&#x8272;</span>

  <span class="token metadata symbol">@override</span>
  Widget <span class="token function">build</span><span class="token punctuation">(</span>BuildContext context<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    ThemeData themeData <span class="token operator">=</span> Theme<span class="token punctuation">.</span><span class="token function">of</span><span class="token punctuation">(</span>context<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> <span class="token function">Theme</span><span class="token punctuation">(</span>
      data<span class="token punctuation">:</span> <span class="token function">ThemeData</span><span class="token punctuation">(</span>
          primarySwatch<span class="token punctuation">:</span> _themeColor<span class="token punctuation">,</span> <span class="token comment">//&#x7528;&#x4E8E;&#x5BFC;&#x822A;&#x680F;&#x3001;FloatingActionButton&#x7684;&#x80CC;&#x666F;&#x8272;&#x7B49;</span>
          iconTheme<span class="token punctuation">:</span> <span class="token function">IconThemeData</span><span class="token punctuation">(</span>color<span class="token punctuation">:</span> _themeColor<span class="token punctuation">)</span> <span class="token comment">//&#x7528;&#x4E8E;Icon&#x989C;&#x8272;</span>
      <span class="token punctuation">)</span><span class="token punctuation">,</span>
      child<span class="token punctuation">:</span> <span class="token function">Scaffold</span><span class="token punctuation">(</span>
        appBar<span class="token punctuation">:</span> <span class="token function">AppBar</span><span class="token punctuation">(</span>title<span class="token punctuation">:</span> <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&quot;&#x4E3B;&#x9898;&#x6D4B;&#x8BD5;&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
        body<span class="token punctuation">:</span> <span class="token function">Column</span><span class="token punctuation">(</span>
          mainAxisAlignment<span class="token punctuation">:</span> MainAxisAlignment<span class="token punctuation">.</span>center<span class="token punctuation">,</span>
          children<span class="token punctuation">:</span> <span class="token operator">&lt;</span>Widget<span class="token operator">&gt;</span><span class="token punctuation">[</span>
            <span class="token comment">//&#x7B2C;&#x4E00;&#x884C;Icon&#x4F7F;&#x7528;&#x4E3B;&#x9898;&#x4E2D;&#x7684;iconTheme</span>
            <span class="token function">Row</span><span class="token punctuation">(</span>
                mainAxisAlignment<span class="token punctuation">:</span> MainAxisAlignment<span class="token punctuation">.</span>center<span class="token punctuation">,</span>
                children<span class="token punctuation">:</span> <span class="token operator">&lt;</span>Widget<span class="token operator">&gt;</span><span class="token punctuation">[</span>
                  <span class="token function">Icon</span><span class="token punctuation">(</span>Icons<span class="token punctuation">.</span>favorite<span class="token punctuation">)</span><span class="token punctuation">,</span>
                  <span class="token function">Icon</span><span class="token punctuation">(</span>Icons<span class="token punctuation">.</span>airport_shuttle<span class="token punctuation">)</span><span class="token punctuation">,</span>
                  <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&quot;  &#x989C;&#x8272;&#x8DDF;&#x968F;&#x4E3B;&#x9898;&quot;</span><span class="token punctuation">)</span>
                <span class="token punctuation">]</span>
            <span class="token punctuation">)</span><span class="token punctuation">,</span>
            <span class="token comment">//&#x4E3A;&#x7B2C;&#x4E8C;&#x884C;Icon&#x81EA;&#x5B9A;&#x4E49;&#x989C;&#x8272;&#xFF08;&#x56FA;&#x5B9A;&#x4E3A;&#x9ED1;&#x8272;)</span>
            <span class="token function">Theme</span><span class="token punctuation">(</span>
              data<span class="token punctuation">:</span> themeData<span class="token punctuation">.</span><span class="token function">copyWith</span><span class="token punctuation">(</span>
                iconTheme<span class="token punctuation">:</span> themeData<span class="token punctuation">.</span>iconTheme<span class="token punctuation">.</span><span class="token function">copyWith</span><span class="token punctuation">(</span>
                    color<span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>black
                <span class="token punctuation">)</span><span class="token punctuation">,</span>
              <span class="token punctuation">)</span><span class="token punctuation">,</span>
              child<span class="token punctuation">:</span> <span class="token function">Row</span><span class="token punctuation">(</span>
                  mainAxisAlignment<span class="token punctuation">:</span> MainAxisAlignment<span class="token punctuation">.</span>center<span class="token punctuation">,</span>
                  children<span class="token punctuation">:</span> <span class="token operator">&lt;</span>Widget<span class="token operator">&gt;</span><span class="token punctuation">[</span>
                    <span class="token function">Icon</span><span class="token punctuation">(</span>Icons<span class="token punctuation">.</span>favorite<span class="token punctuation">)</span><span class="token punctuation">,</span>
                    <span class="token function">Icon</span><span class="token punctuation">(</span>Icons<span class="token punctuation">.</span>airport_shuttle<span class="token punctuation">)</span><span class="token punctuation">,</span>
                    <span class="token function">Text</span><span class="token punctuation">(</span><span class="token string">&quot;  &#x989C;&#x8272;&#x56FA;&#x5B9A;&#x9ED1;&#x8272;&quot;</span><span class="token punctuation">)</span>
                  <span class="token punctuation">]</span>
              <span class="token punctuation">)</span><span class="token punctuation">,</span>
            <span class="token punctuation">)</span><span class="token punctuation">,</span>
          <span class="token punctuation">]</span><span class="token punctuation">,</span>
        <span class="token punctuation">)</span><span class="token punctuation">,</span>
        floatingActionButton<span class="token punctuation">:</span> <span class="token function">FloatingActionButton</span><span class="token punctuation">(</span>
            onPressed<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span>  <span class="token comment">//&#x5207;&#x6362;&#x4E3B;&#x9898;</span>
                <span class="token function">setState</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span>
                _themeColor <span class="token operator">=</span>
                _themeColor <span class="token operator">==</span> Colors<span class="token punctuation">.</span>teal <span class="token operator">?</span> Colors<span class="token punctuation">.</span>blue <span class="token punctuation">:</span> Colors<span class="token punctuation">.</span>teal
                <span class="token punctuation">)</span><span class="token punctuation">,</span>
            child<span class="token punctuation">:</span> <span class="token function">Icon</span><span class="token punctuation">(</span>Icons<span class="token punctuation">.</span>palette<span class="token punctuation">)</span>
        <span class="token punctuation">)</span><span class="token punctuation">,</span>
      <span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x8FD0;&#x884C;&#x540E;&#x70B9;&#x51FB;&#x53F3;&#x4E0B;&#x89D2;&#x60AC;&#x6D6E;&#x6309;&#x94AE;&#x5219;&#x53EF;&#x4EE5;&#x5207;&#x6362;&#x4E3B;&#x9898;&#xFF0C;&#x5982;&#x56FE;7-6&#x3001;7-7&#x6240;&#x793A;&#xFF1A;</p>
<p><img src="https://pcdn.flutterchina.club/imgs/7-6.png" alt="&#x56FE;7-6"><img src="https://pcdn.flutterchina.club/imgs/7-7.png" alt="&#x56FE;7-7"></p>
<p>&#x9700;&#x8981;&#x6CE8;&#x610F;&#x7684;&#x6709;&#x4E09;&#x70B9;&#xFF1A;</p>
<ul>
<li><p>&#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#x5C40;&#x90E8;&#x4E3B;&#x9898;&#x8986;&#x76D6;&#x5168;&#x5C40;&#x4E3B;&#x9898;&#xFF0C;&#x6B63;&#x5982;&#x4EE3;&#x7801;&#x4E2D;&#x901A;&#x8FC7;Theme&#x4E3A;&#x7B2C;&#x4E8C;&#x884C;&#x56FE;&#x6807;&#x6307;&#x5B9A;&#x56FA;&#x5B9A;&#x989C;&#x8272;&#xFF08;&#x9ED1;&#x8272;&#xFF09;&#x4E00;&#x6837;&#xFF0C;&#x8FD9;&#x662F;&#x4E00;&#x79CD;&#x5E38;&#x7528;&#x7684;&#x6280;&#x5DE7;&#xFF0C;Flutter&#x4E2D;&#x4F1A;&#x7ECF;&#x5E38;&#x4F7F;&#x7528;&#x8FD9;&#x79CD;&#x65B9;&#x6CD5;&#x6765;&#x81EA;&#x5B9A;&#x4E49;&#x5B50;&#x6811;&#x4E3B;&#x9898;&#x3002;&#x90A3;&#x4E48;&#x4E3A;&#x4EC0;&#x4E48;&#x5C40;&#x90E8;&#x4E3B;&#x9898;&#x53EF;&#x4EE5;&#x8986;&#x76D6;&#x5168;&#x5C40;&#x4E3B;&#x9898;&#xFF1F;&#x8FD9;&#x4E3B;&#x8981;&#x662F;&#x56E0;&#x4E3A;widget&#x4E2D;&#x4F7F;&#x7528;&#x4E3B;&#x9898;&#x6837;&#x5F0F;&#x65F6;&#x662F;&#x901A;&#x8FC7;<code>Theme.of(BuildContext context)</code>&#x6765;&#x83B7;&#x53D6;&#x7684;&#xFF0C;&#x6211;&#x4EEC;&#x770B;&#x770B;&#x5176;&#x7B80;&#x5316;&#x540E;&#x7684;&#x4EE3;&#x7801;&#xFF1A;</p>
</li>
<li><pre class="language-"><code class="lang-dart"><span class="token keyword">static</span> ThemeData <span class="token function">of</span><span class="token punctuation">(</span>BuildContext context<span class="token punctuation">,</span> <span class="token punctuation">{</span> bool shadowThemeOnly <span class="token operator">=</span> <span class="token boolean">false</span> <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
   <span class="token comment">// &#x7B80;&#x5316;&#x4EE3;&#x7801;&#xFF0C;&#x5E76;&#x975E;&#x6E90;&#x7801;  </span>
   <span class="token keyword">return</span> context<span class="token punctuation">.</span><span class="token function">inheritFromWidgetOfExactType</span><span class="token punctuation">(</span>_InheritedTheme<span class="token punctuation">)</span><span class="token punctuation">.</span>theme<span class="token punctuation">.</span>data
<span class="token punctuation">}</span>
</code></pre>
<p><code>context.inheritFromWidgetOfExactType</code> &#x4F1A;&#x5728;widget&#x6811;&#x4E2D;&#x4ECE;&#x5F53;&#x524D;&#x4F4D;&#x7F6E;&#x5411;&#x4E0A;&#x67E5;&#x627E;&#x7B2C;&#x4E00;&#x4E2A;&#x7C7B;&#x578B;&#x4E3A;<code>_InheritedTheme</code>&#x7684;widget&#x3002;&#x6240;&#x4EE5;&#x5F53;&#x5C40;&#x90E8;&#x6307;&#x5B9A;<code>Theme</code>&#x540E;&#xFF0C;&#x5176;&#x5B50;&#x6811;&#x4E2D;&#x901A;&#x8FC7;<code>Theme.of()</code>&#x5411;&#x4E0A;&#x67E5;&#x627E;&#x5230;&#x7684;&#x7B2C;&#x4E00;&#x4E2A;<code>_InheritedTheme</code>&#x4FBF;&#x662F;&#x6211;&#x4EEC;&#x6307;&#x5B9A;&#x7684;<code>Theme</code>&#x3002;</p>
</li>
<li><p>&#x672C;&#x793A;&#x4F8B;&#x662F;&#x5BF9;&#x5355;&#x4E2A;&#x8DEF;&#x7531;&#x6362;&#x80A4;&#xFF0C;&#x5982;&#x679C;&#x60F3;&#x8981;&#x5BF9;&#x6574;&#x4E2A;&#x5E94;&#x7528;&#x6362;&#x80A4;&#xFF0C;&#x5219;&#x53EF;&#x4EE5;&#x53BB;&#x4FEE;&#x6539;<code>MaterialApp</code>&#x7684;<code>theme</code>&#x5C5E;&#x6027;&#x3002;</p>
</li>
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